There are several different types of Bitcoin clients. The most secure are full nodes like Bitcoin Core, which will follow the rules of the network no matter what miners do. Even if every miner decided to create 1000 bitcoins per block, full nodes would stick to the rules and reject those blocks.

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I don't know what a "Deflationary death spiral" is. I guess you mean a deflation not caused only by growth but also by shrinking credit and thus liquidity. But that has to do with debt creation and interest, not with the divisibility of the currency.